JAI AD-081GE - Manual (Page 40)

AD-081GE
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The variable scan readout is connected with the ROI settings.
1. If ROI is set, these settings are applied to the partial scan settings.
2. If the multi ROI is used, the smallest number of the line and the largest number of the line
define the partial scan area.
3. In the case of sequence trigger, it is the same as for multi ROI. The smallest line and the
largest line define the partial scan.
In order to execute the partial scan, the fast dump should be ON.
Fig.28 variable partial scan
How to calculate total line number and frame rate on variable partial scan mode
Variable partial scan The start line setting 1 st line to 760 th line
Readout height 8 lines to 768 lines
Total lines = ①OB period in the upper part of the frame (L) + ②Fast Dump period in the
upper part of the frame (L) + ③Readout lines(L) + ④Fast dump period in the
lower part of frame(L) +⑤Dummy transfer period
Where,
① OB period in the upper part of the frame= 3L
② Fast dump period for the upper part= Round up + 1
③ Readout lines = Effective lines + 4L
④ Fast dump period for the lower part= Round up
⑤ Dummy transfer period = 4L
Frame rate (fps) = Horizontal Frequency / Total lines
where, Horizontal Frequency 23.768KHz
Calculation example
Readout: 1/2 partial at the center (384L), Start line (193), End line (576)
Image Height
Image start line
Minimum: 8 lines
Maximum: 768 lines
Image starts at 1st line
1
760
8 lines
768 lines
When line number is set at 8 lines,
image starts at 760th line